28 ROCHESTER ACADEMY OF SCIENCE. [Nov. 23, 



120. Pentadactylus digitatus, Lam. 



" " " var. lobatus, Hlaino. 



121. " (Morula) cancellatus, Quoy. 



122. " " undatus, Chemn. 

 The above four forms seem to be quite common. 



Sub-family Coralliophilin.'E. 



123. Coralliophila exarata, Pease. ' 



124. " costularis, Lam. 



125. " (Coralliobia) fimbriata, A. Adams. 



126. " " Robillardi, Lienard. 



This group (Coralliobia) was made a sub-genus of Concholepas 

 by the Messrs. Adams, but I agree with Fischer (Manuel de Conchy- 

 liologie, p. 647), in considering it a sub-genus under Coralliophila. 

 Tryon (Manual of Conchology, p. 217), makes it a synomym of 

 Magilus, a decision in which I can by no means concur. In the 

 material before me, lam able to distinguish two forms, one {^fimbri- 

 ata, A. Ad.,) distinguished by heavy spiral ribs and by the apex 

 being visible and a little raised above the body-whorl, while the other 

 {Robillardi, Lienard) is distinguished by numerous spiral lines and by 

 the apex being covered by the body-whorl. I have seen a large 

 number of both of these forms and this distinction holds good 

 throughout the entire series. 



127. Magilus antiquus, Lam. 



128. Leptoconchus Cumingii, Desh. 



129. " Maillardi, Desh. 



The Magili are well represented, both in species and specimens, 

 from the young individual of paper-like consistency, to the adult 

 animal with a tube nearly or quite a foot in length. 



Family lANTHINIDiE. 



130. lanthina fragilis, Lam., var. trochoidea, Reeve. 



131. " globosa, Linn. 



Both forms are very abundant. This genus is subject to such 

 extremes of variation, that it is almost an impossibility to give a 



